Kind of depends on what your circumstances are. How much does it cost and how much can you afford? I'm all for buying a car you know nothing about and using it as a learning experience. I just did that with my new 240D. But the cost was nothing for me, and the cost to fix it/mess it up/fix what I messed up is well within my means. As far as 4matics, I couldn't tell you much, other that it's a pretty car.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)